As fans know, The Flash is actually an Arrow spinoff. Grant Gustin’s Barry Allen debuted on Arrow earlier this year in a two-part episode that set things up nicely for the Flash pilot episode. In addition, two regular Flash cast members, Danielle Panabaker and Carlos Valdes, appeared in a key episode last month as their Flash character Caitlin Snow and Cisco Ramon.

Also working in the show’s favor is that The Flash is executive produced by Greg Berlanti, Andrew Kreisberg (both of whom also executive produce Arrow) and Geoff Johns, who also penned the pilot episode.

Meanwhile, iZombie is inspired by the Vertigo comic book created by Chris Roberson and Michael Allred and features a pilot script written by Veronica Mars’ Rob Thomas and Diane Ruggiero. iZombie is about a med student-turned-zombie named Liv who takes a job in the coroner’s office to gain access to the brains she must eat to maintain her humanity, but with each brain she consumes, she inherits the corpse’s memories. With the help of her medical examiner boss and a police detective, she solves homicide cases in order to quiet the disturbing voices in her head.

iZombie stars Once Upon a Time’s Rose McIver as Liv, as well as Robert Buckley, David Anders, Malcolm J. Goodwin, Alexandra Krosney and Rahul Kohli. The one-hour drama is executive produced by Thomas and Ruggiero, as well as Warner Bros. TV’s Dan Etheridge and Danielle Stokdyk.